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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fa0c2d62dd264e0b8481d8c26f1316ec3cfe0c14b30d84139c1cd6ffdbe6085' 
  AND token = 'f+A7VS9kmmXSkX2A6Y3RgbuwMImrWikOjI8ExNWSj04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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