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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1e49d62f16bbedd25442db701b18e55187d8a2ee44e04c916e4868c4e16de3d' 
  AND token = '/nJI9dFozp5ebkW4+toBVKUd/aBwpMpfgELo/enRaeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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