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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '115079da94ca4029254a5d87e13964bf20e4470d49db82caf64e7cec446203ba' 
  AND token = 'A30+zleGe3DLlixPqxUP22AhVievLxyiDVwWzy2Dmxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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