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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5cf87bb038c901ccd88eb3b2e648d4b11c9f62e9e501cdf8d30a215b530f246' 
  AND token = '8QC8GWI4rOGNPd/SbhuXxc/pvHQf6tKkTa4yXvLDE5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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