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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a916d8cf74a84b33e07575a0e3fc79d40aba6da08ee8965ca21d7e794f563bc' 
  AND token = 'aohIGSOzcWPMiMP9iQ7So+MYI+N8V8NytQHzZ4MohL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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