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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '525d151cb15c25a88ef963e86695ca7e3da3238de2caead018f217c257f0f9f3' 
  AND token = 'tjcau6eCPhkn2yS7BLxg8Q/1ttFEGuAVFFgvxZJNV+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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