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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf7ab3d65e9e5aa1861b70478f56872bd44365ab2672cce8740516cafa7d118a' 
  AND token = 'j8CMc3P/6k2m5iF/AqhUBVbysA9SjhIADYW/C/siBqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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