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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e43f5c7b4815405c234f763e64529f3d2b5a1d207ec412fd73cd0fd74f0cfcb' 
  AND token = 'nuM87k2DjvDc7HKnU9V/lQiAXpFvB5YKZh/i3lbMic0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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