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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bc21f20974417cef40b32a12b1646418f13dde87061ed2069fb12b1afb0276d' 
  AND token = 'bjvjTkTOFWabK+0EZwi9aqiNyBWmasnY3M8HA4DJirs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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