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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68bac7d9964c6d5846d36643db9cf8ec0e3d5bc0490c9b5fbc42b31dece09a00' 
  AND token = '2tYFln9onxwzdKM4wLY3UzMARvmNkMBXmlXfhn6mGxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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