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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abe625e9d0ac6a9d61e95a54bb06398fa3572b987326213cbd843b5827c7c4c2' 
  AND token = 'UZ8xfuzKSM3jIBu8Ms52LM7zefvYHayZ1PJvYAc2CcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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