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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a023c6b49f364bd15d792fb7e7f477b99df307cea03d160690f0c0af23d1e341' 
  AND token = 'PfsBKQPlwObLq+N0iS3PF27mg9nOm4k53PArMDGpoNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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