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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e3b3262a1962dcb6632a0786cf537ba9d9f701730fffc24f871e50116e3eb01' 
  AND token = 'gGTIoQqFMHil4MsGbnHcBCK5BHAaU5PpbcNnMO4UcPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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