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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74fddf5c3bea419b4b6a3d8c2147935a186f98c59bb7c2727246f9230f0b550d' 
  AND token = 'qcERnK6CubfqNIuaOLA66RHA0VSTmYBuS1pR5HV28vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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