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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbf2661306599871a36c949d98c0664f4f859c89c0350847f538732df4c54958' 
  AND token = 'BykpW8TsaEuRcYww9a/VvM7yR/sIVOX7PxaMmlazClI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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