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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7980b2f31dd285f58cc997d7714a9f86784bdd55060e117dca169153d80e64c' 
  AND token = 'cr9iJi/BKjxFfn/OadmF5GV2p01qQcV2ScRdyG+V5S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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