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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18a2bf2c43034c6b9153e7d0e891cc27e3e0146c420b8ae08dea8483d569c1c9' 
  AND token = '0f1IjjbVG7kzunwMgzZ9yNkpLTRgiszrRRAXRWxJunU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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