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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0896bb2eb740087c6544cf1451646e201402cffc9f5220620a2e4c9c5ffad2f4' 
  AND token = 'saHdZS0/IpVjYqIH48VUl2uXZUY+Kxfp9l9aPQjl/8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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