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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd940f135cf944c11e0fe216f70942368c840b68c4b40b8e89c011ad885ffc23f' 
  AND token = '1sqKYp7x1YQKMd6aMmOjF24erTMcTr6lW90rWgag7Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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