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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4ab1208e9bc62245377d51224fe30fbeff7071e5cca2a1676669eaff161df9a' 
  AND token = 'bwEc8G5eDUBmaaC2mLOQtE3SlTnZT7bBxkLLECVIxqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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