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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f37089a26beaf5ec9af906163a0da14feba778b3e5deb79abce8365af53847d' 
  AND token = '+bSFqFEE3iVJhIfB4w1GDRH0yex7ZePqwkk7DWE8yjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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