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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a252e10c7da50b65079f191414d1fa12d67a923c1c7e9d201601d23e052fd54c' 
  AND token = 'm7MihV9fR7g0URJMD3qv5Ndz9f5+ec34mM5wsrIoL88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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