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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09cfcb481298e4173a213b0f9c0a3cbb00833923dd8623c452fc7aecd2c0c879' 
  AND token = 'HW6PkqmymHe0LIE62Z+OnADcGp9prGYEV6mjQmNJlRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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