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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36e36e5e1311d1494bc6d2de4f38d6254532fda310e9c79350aceb081a2041af' 
  AND token = 'NtXEmIMT8RT8700+kYU+Q7vvIHAoCayEjtHTRIH5etc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}