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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d072fe8a4be85c2fbb2b725effd543cf1fafc9698009022211b7a0045b87897' 
  AND token = '/4hjQAoBdtUoAXL7DdSiol0PSZd345+O8Us7jnnBRHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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