SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fbad90989f5bf779f3fc6fb3757dea4ef3b0d5c5ae896415937c97d81ebbe12' 
  AND token = 'xMBQwGdU4M3mvVEjkumGy7+kVnbfhFKxuYXUJnGxP3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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