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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09ba16ef5c94dcc343ee05e7726080bcdf33188dd1dc89e6665dd3022aa8b8c4' 
  AND token = 'Wd7cPkUS2RKSuGAVPV3SmURo5/HzZ2Is22o0/8NjhCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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