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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3b62eea6fba79ad0428ab35939b9a87ca2a2a2adee3aaad1003014019084a00' 
  AND token = 'fglxO+1l8/wtZcGBCrLcUlfljOjMxCdIUXfvujgpfJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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