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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74f89e188fdbedd4b567ac786919de1dfb4f1e60e196733bebc9d5847f5e197a' 
  AND token = '7tjWWon4hw5b+p97TNX34bExqU7A1Js6LEZROSwj6vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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