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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa42f9d0d15ea5056cd0dcce7c9575b0bf4ec3cdbbf160f2693bbcde4171fe7d' 
  AND token = 'Z5bkBKQCqSSfeNXR0hhHCe3mBEY9Siu5w3L04JtSAR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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