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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78e8c6b5720686ef92e7723c7200d99c8fe740362bf5447fc8c18727fb2d2d70' 
  AND token = 'ZjjubyATzif5Nwf+v39IAJFPhScKHeyn29DN0Nm0F3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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