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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6070d4d98490c5327a37f5b91f70727de1aa5d939229f2f338915eb551c17c73' 
  AND token = 'c3kuK1EuUEHfLAAs58b8udUHIiei9aasYcTM0ZhkmtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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