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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04aa78212876ea4ce46626b608342ee13ecedf5ef285f93933368dc73f1f6dac' 
  AND token = 'IUq5tcFV0wWloNsqCcCtXZAIFCc4wUCN0ZpgqcAyu3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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