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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '379fd6cbdde8377269b515af2ac3f8d3805678b17b2c8a1088d1d86d90d14e0e' 
  AND token = '7tw9eE+kBkrAw7gmwMIaa5yr40naGyH1EPmN9lLHrrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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