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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71a12eeefb6f13f5cddd6953d4f4b65c51abaeaf7c729247d5239745b53fbec3' 
  AND token = 'uheV3z2bJnsteB/N72IjzrtbOWQw2TTE3VFdw85AG/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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