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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b403d605756cadc868ace3c29c0a0e84299ba9bac0032a6e63850e963849c43b' 
  AND token = 'JqD2Yi4feyAohM8MkeuuIPvgatg8rDX/JrhQ98jbOZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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