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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4440ef3eaa1912dd5f2d5bb59a1209364013fe068445d979f19c284bbd1525c2' 
  AND token = 'mG+iyPXCcOaBQEzQqEI9K2B2Mxf1312Py2hmD9JsuGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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