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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c440ca79655ad88b1c093dec9e2408aa3417daf07ce72cf9b8181868963e17b6' 
  AND token = 'wvwSayi/zXbfJZWW8uBUbyqBIafr3vBlrTQi/n0057Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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