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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36213e9463bb53f8e653cf2183a8acc1ba08158e32009fb148e13aa3a351c31c' 
  AND token = 'iNoWp3Qby6A5pjOCoBSUiYb8+w6lGRjTGyZ09DOANjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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