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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '133ed5d505cd64545e6935605bea451758c4a23aa94c28faeda9daabfe41c8e2' 
  AND token = 'WVq5wyHzwZVDta664FqgxZ8prQtP/m7xEar0TLXaGPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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