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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c752c28180a36a1043323b4e2da00d4a09b25884b77d16e76dd09b82850388c8' 
  AND token = 'aappLT/x1vdK+9iVg7KddVs9m6w/5abFvW0cKwYXL0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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