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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c4e41cd360ae3da9d72aa931f179999d1e2eef96b55e40f9fb18241aeb297a0' 
  AND token = 'VZGem4lXbi6JRIdhx/n6H5EWx5YwMRxaO9cvm5Hyv6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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