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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '547c3b32c19fe089731851dc9e7824740d55b615ec0b6594d5aef2c5045ae360' 
  AND token = 'Oiv6dhTLv4KZ7vC8yAyZ1QtJuVU9owOJHyIFP4JC45w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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