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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3510599c50efb7b537db58a9251d3cdbf1a40dd8600750208491976fa9c443c' 
  AND token = 'S7lIl2sumPf4gz624965EnKBNx3Rj4Em3PS59r4eerI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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