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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b6414036dd0b448ed89ee37433a00d43ed1919bc38b304dd2dfd4343eb40950' 
  AND token = 'B0/Tggt/svvyu9ICPK7sc/Ru7+mDv153fV4uM7K0rGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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