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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45e12f050d1931b10b7911016e35819a22e08b6945463e0bd513c6683ab7e8ea' 
  AND token = 'iAxGSU6Evk23g1nxtqdxbZFEjPd50JL8aFNvSErgfms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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