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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07a6cd8e56ba182e76a74b5e994219ddba19ec008d2f265441d264811d52413b' 
  AND token = 'Fy6iDIx3t9HiQ30T70g460NVbfB37dKZLlgt3pIdQPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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