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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26e0e771e377d8d988fcfd87b97b81a12458bee4620b01f34a1fc84252941fe7' 
  AND token = 'bqdwaUuKVDT5+8PDtooW4dBBstFQcNdFcv/afNUeo3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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