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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cffbb3f7b92561b259e4d1dfbf4e0cdbaac4e1c7ef124808a861295039cbd125' 
  AND token = '4EPfxECCJfxMSOAhAOdsDUgr+MDTod8VOJRp68GUa0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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