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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4afc429449f8df72e3e1a5967dbeb17e36d7d6d01d3a93485f1a178648be43e' 
  AND token = 'M81cZtOX6h6642h+D4BxocRSYmfZlfDfF4Oq6UcIdAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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