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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f1901922da19513eecb52e480e6c8a4dd7be49f4479f415dd74e0e9bdf6e109' 
  AND token = 'dDIdDl9Vb4Zzaej79UWwy0Pled/b5VPO+w7cLq9GlpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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