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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '047063d30d9004c66be341e7e09629feb1e9f3b703887e24cb70a319eab698ae' 
  AND token = '9EFWvIVP+ywb4ZADvA51ZejQULyS+t8arc0QdHTHqI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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