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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f65500bef0b6b46d780e7d8faef9cddc4b946a679a9237f68a8462d123003752' 
  AND token = 'N0/CDoe7OSEC4kXFjFuDxxIfUpzxz38V6euMfzwDh0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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